rake tasks fails to run ruby v2.5.0 / rails v5.2.0.beta2

[neumayr]

rake fails to run with latest ruby v2.5.0 / rails v5.2.0.beta2

already initialized constant Rake::*

System

$ rvm --version
rvm 1.29.3 (latest)
$ ruby -v
ruby 2.5.0p0 (2017-12-25 revision 61468) [x86_64-darwin17]
$ gem --version
2.7.4
$ rake --version
rake, version 12.3.0
$ gem list | grep bootsnap
bootsnap (1.1.7)

Output of rake -T

$ rake -T
/Users/dev/.rvm/gems/ruby-2.5.0@global/gems/rake-12.3.0/lib/rake/version.rb:3: warning: already initialized constant Rake::VERSION
/Users/dev/.rvm/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0/gems/rake-12.3.0/lib/rake/version.rb:3: warning: previous definition of VERSION was here
/Users/dev/.rvm/gems/ruby-2.5.0@global/gems/rake-12.3.0/lib/rake/version.rb:6: warning: already initialized constant Rake::Version::MAJOR
/Users/dev/.rvm/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0/gems/rake-12.3.0/lib/rake/version.rb:6: warning: previous definition of MAJOR was here
/Users/dev/.rvm/gems/ruby-2.5.0@global/gems/rake-12.3.0/lib/rake/version.rb:6: warning: already initialized constant Rake::Version::MINOR
/Users/dev/.rvm/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0/gems/rake-12.3.0/lib/rake/version.rb:6: warning: previous definition of MINOR was here
/Users/dev/.rvm/gems/ruby-2.5.0@global/gems/rake-12.3.0/lib/rake/version.rb:6: warning: already initialized constant Rake::Version::BUILD
/Users/dev/.rvm/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0/gems/rake-12.3.0/lib/rake/version.rb:6: warning: previous definition of BUILD was here
/Users/dev/.rvm/gems/ruby-2.5.0@global/gems/rake-12.3.0/lib/rake/version.rb:6: warning: already initialized constant Rake::Version::OTHER
/Users/dev/.rvm/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0/gems/rake-12.3.0/lib/rake/version.rb:6: warning: previous definition of OTHER was here
/Users/dev/.rvm/gems/ruby-2.5.0@global/gems/rake-12.3.0/lib/rake/version.rb:8: warning: already initialized constant Rake::Version::NUMBERS
/Users/dev/.rvm/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0/gems/rake-12.3.0/lib/rake/version.rb:8: warning: previous definition of NUMBERS was here
WARNING: Possible conflict with Rake extension: String#ext already exists
WARNING: Possible conflict with Rake extension: String#pathmap already exists
/Users/dev/.rvm/gems/ruby-2.5.0@global/gems/rake-12.3.0/lib/rake/linked_list.rb:110: warning: already initialized constant Rake::LinkedList::EMPTY
/Users/dev/.rvm/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0/gems/rake-12.3.0/lib/rake/linked_list.rb:110: warning: previous definition of EMPTY was here
/Users/dev/.rvm/gems/ruby-2.5.0@global/gems/rake-12.3.0/lib/rake/scope.rb:41: warning: already initialized constant Rake::Scope::EMPTY
/Users/dev/.rvm/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0/gems/rake-12.3.0/lib/rake/scope.rb:41: warning: previous definition of EMPTY was here
/Users/dev/.rvm/gems/ruby-2.5.0@global/gems/rake-12.3.0/lib/rake/file_utils.rb:10: warning: already initialized constant FileUtils::RUBY
/Users/dev/.rvm/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0/gems/rake-12.3.0/lib/rake/file_utils.rb:10: warning: previous definition of RUBY was here
/Users/dev/.rvm/gems/ruby-2.5.0@global/gems/rake-12.3.0/lib/rake/file_utils.rb:109: warning: already initialized constant FileUtils::LN_SUPPORTED
/Users/dev/.rvm/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0/gems/rake-12.3.0/lib/rake/file_utils.rb:109: warning: previous definition of LN_SUPPORTED was here
/Users/dev/.rvm/gems/ruby-2.5.0@global/gems/rake-12.3.0/lib/rake/file_utils_ext.rb:17: warning: already initialized constant Rake::FileUtilsExt::DEFAULT
/Users/dev/.rvm/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0/gems/rake-12.3.0/lib/rake/file_utils_ext.rb:17: warning: previous definition of DEFAULT was here
/Users/dev/.rvm/gems/ruby-2.5.0@global/gems/rake-12.3.0/lib/rake/file_list.rb:44: warning: already initialized constant Rake::FileList::ARRAY_METHODS
/Users/dev/.rvm/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0/gems/rake-12.3.0/lib/rake/file_list.rb:44: warning: previous definition of ARRAY_METHODS was here
/Users/dev/.rvm/gems/ruby-2.5.0@global/gems/rake-12.3.0/lib/rake/file_list.rb:47: warning: already initialized constant Rake::FileList::MUST_DEFINE
/Users/dev/.rvm/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0/gems/rake-12.3.0/lib/rake/file_list.rb:47: warning: previous definition of MUST_DEFINE was here
/Users/dev/.rvm/gems/ruby-2.5.0@global/gems/rake-12.3.0/lib/rake/file_list.rb:51: warning: already initialized constant Rake::FileList::MUST_NOT_DEFINE
/Users/dev/.rvm/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0/gems/rake-12.3.0/lib/rake/file_list.rb:51: warning: previous definition of MUST_NOT_DEFINE was here
/Users/dev/.rvm/gems/ruby-2.5.0@global/gems/rake-12.3.0/lib/rake/file_list.rb:55: warning: already initialized constant Rake::FileList::SPECIAL_RETURN
/Users/dev/.rvm/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0/gems/rake-12.3.0/lib/rake/file_list.rb:55: warning: previous definition of SPECIAL_RETURN was here
/Users/dev/.rvm/gems/ruby-2.5.0@global/gems/rake-12.3.0/lib/rake/file_list.rb:61: warning: already initialized constant Rake::FileList::DELEGATING_METHODS
/Users/dev/.rvm/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0/gems/rake-12.3.0/lib/rake/file_list.rb:61: warning: previous definition of DELEGATING_METHODS was here
/Users/dev/.rvm/gems/ruby-2.5.0@global/gems/rake-12.3.0/lib/rake/file_list.rb:86: warning: already initialized constant Rake::FileList::GLOB_PATTERN
/Users/dev/.rvm/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0/gems/rake-12.3.0/lib/rake/file_list.rb:86: warning: previous definition of GLOB_PATTERN was here
/Users/dev/.rvm/gems/ruby-2.5.0@global/gems/rake-12.3.0/lib/rake/file_list.rb:381: warning: already initialized constant Rake::FileList::DEFAULT_IGNORE_PATTERNS
/Users/dev/.rvm/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0/gems/rake-12.3.0/lib/rake/file_list.rb:381: warning: previous definition of DEFAULT_IGNORE_PATTERNS was here
/Users/dev/.rvm/gems/ruby-2.5.0@global/gems/rake-12.3.0/lib/rake/file_list.rb:387: warning: already initialized constant Rake::FileList::DEFAULT_IGNORE_PROCS
/Users/dev/.rvm/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0/gems/rake-12.3.0/lib/rake/file_list.rb:387: warning: previous definition of DEFAULT_IGNORE_PROCS was here
/Users/dev/.rvm/gems/ruby-2.5.0@global/gems/rake-12.3.0/lib/rake/promise.rb:12: warning: already initialized constant Rake::Promise::NOT_SET
/Users/dev/.rvm/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0/gems/rake-12.3.0/lib/rake/promise.rb:12: warning: previous definition of NOT_SET was here
/Users/dev/.rvm/gems/ruby-2.5.0@global/gems/rake-12.3.0/lib/rake/application.rb:13: warning: already initialized constant Rake::CommandLineOptionError
/Users/dev/.rvm/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0/gems/rake-12.3.0/lib/rake/application.rb:13: warning: previous definition of CommandLineOptionError was here
/Users/dev/.rvm/gems/ruby-2.5.0@global/gems/rake-12.3.0/lib/rake/application.rb:41: warning: already initialized constant Rake::Application::DEFAULT_RAKEFILES
/Users/dev/.rvm/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0/gems/rake-12.3.0/lib/rake/application.rb:41: warning: previous definition of DEFAULT_RAKEFILES was here
/Users/dev/.rvm/gems/ruby-2.5.0@global/gems/rake-12.3.0/lib/rake/task_arguments.rb:108: warning: already initialized constant Rake::EMPTY_TASK_ARGS
/Users/dev/.rvm/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0/gems/rake-12.3.0/lib/rake/task_arguments.rb:108: warning: previous definition of EMPTY_TASK_ARGS was here
/Users/dev/.rvm/gems/ruby-2.5.0@global/gems/rake-12.3.0/lib/rake/invocation_chain.rb:55: warning: already initialized constant Rake::InvocationChain::EMPTY
/Users/dev/.rvm/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0/gems/rake-12.3.0/lib/rake/invocation_chain.rb:55: warning: previous definition of EMPTY was here
/Users/dev/.rvm/gems/ruby-2.5.0@global/gems/rake-12.3.0/lib/rake/early_time.rb:21: warning: already initialized constant Rake::EARLY
/Users/dev/.rvm/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0/gems/rake-12.3.0/lib/rake/early_time.rb:21: warning: previous definition of EARLY was here
/Users/dev/.rvm/gems/ruby-2.5.0@global/gems/rake-12.3.0/lib/rake/late_time.rb:17: warning: already initialized constant Rake::LATE
/Users/dev/.rvm/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0/gems/rake-12.3.0/lib/rake/late_time.rb:17: warning: previous definition of LATE was here
/Users/dev/.rvm/gems/ruby-2.5.0@global/gems/rake-12.3.0/lib/rake/backtrace.rb:4: warning: already initialized constant Rake::Backtrace::SYS_KEYS
/Users/dev/.rvm/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0/gems/rake-12.3.0/lib/rake/backtrace.rb:4: warning: previous definition of SYS_KEYS was here
/Users/dev/.rvm/gems/ruby-2.5.0@global/gems/rake-12.3.0/lib/rake/backtrace.rb:5: warning: already initialized constant Rake::Backtrace::SYS_PATHS
/Users/dev/.rvm/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0/gems/rake-12.3.0/lib/rake/backtrace.rb:5: warning: previous definition of SYS_PATHS was here
/Users/dev/.rvm/gems/ruby-2.5.0@global/gems/rake-12.3.0/lib/rake/backtrace.rb:8: warning: already initialized constant Rake::Backtrace::SUPPRESSED_PATHS
/Users/dev/.rvm/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0/gems/rake-12.3.0/lib/rake/backtrace.rb:8: warning: previous definition of SUPPRESSED_PATHS was here
/Users/dev/.rvm/gems/ruby-2.5.0@global/gems/rake-12.3.0/lib/rake/backtrace.rb:12: warning: already initialized constant Rake::Backtrace::SUPPRESSED_PATHS_RE
/Users/dev/.rvm/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0/gems/rake-12.3.0/lib/rake/backtrace.rb:12: warning: previous definition of SUPPRESSED_PATHS_RE was here
/Users/dev/.rvm/gems/ruby-2.5.0@global/gems/rake-12.3.0/lib/rake/backtrace.rb:16: warning: already initialized constant Rake::Backtrace::SUPPRESS_PATTERN
/Users/dev/.rvm/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0/gems/rake-12.3.0/lib/rake/backtrace.rb:16: warning: previous definition of SUPPRESS_PATTERN was here
/Users/dev/.rvm/gems/ruby-2.5.0@global/gems/rake-12.3.0/lib/rake.rb:70: warning: already initialized constant FileList
/Users/dev/.rvm/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0/gems/rake-12.3.0/lib/rake.rb:70: warning: previous definition of FileList was here
/Users/dev/.rvm/gems/ruby-2.5.0@global/gems/rake-12.3.0/lib/rake.rb:71: warning: already initialized constant RakeFileUtils
/Users/dev/.rvm/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0/gems/rake-12.3.0/lib/rake.rb:71: warning: previous definition of RakeFileUtils was here

Workarounds

• rails -T is working fine.
• If I comment require 'bootsnap/setup' in config/boot.rb,
  rake -T runs without errors

[BroiSatse]

Having the same issue with ruby 2.5.0 / rails 5.1.4. Downgrading to ruby 2.4.3 removes all the warnings and fixes the issue. Also, running bin/rake instead of rake seems to work as well - bin/rake requires config/boot (which requires bootsnap) before loading rake, so it seems to be some dependency requirement order issue.

My initial guess was that rake is loading rake before the bootsnap is loaded and that somehow causes bootsnap to re-require same file again. Need to dig more into that though.

[nynhex]

I had the same issue and followed @BroiSatse suggestion which solved the issue temporarily for me.

[ojab]

Can you please check if #136 fixes the issue? You can try it with gem 'bootsnap', github: 'ojab/bootsnap', require: false in Gemfile.

[neumayr]

Can you please check if #136 fixes the issue? You can try it with gem 'bootsnap', github: 'ojab/bootsnap', require: false in Gemfile.

@ojab Yes, with your bootsnap fork rake -T is working again

[burke]

I bet this is fixed in version 1.2.0.pre, please let me know whether that fixes this issue or not.

[neumayr]

I bet this is fixed in version 1.2.0.pre, please let me know whether that fixes this issue or not.

@burke 🙅 Nope, v1.2.0.pre isn't fixing the problem.

[burke]

1.3.0 includes @ojab's patch, so I'm closing this. Thanks everyone!